关于#python#的问题：请用Python解答

如图所示，请用Python解答，最好加一点注释，第三和第四题

a = {'张三':45,'李思':78,'王吴':40,'周六':96,'赵琪':65,'孙霸':90,'郑九':78,'吴诗':99,'董世义':60}
ages = [a[k] for k in a]
mx = max(ages)
mn = min(ages)
avg = sum(ages) / len(ages)
grade = 'abcde'[::1]
print('最高分：{}，最低分：{}，平均分：{}'.format(mx,mn,round(avg,1)))
for k in a:
    print('{} 成绩为 {}'.format(k,grade[a[k] // 20]))

a = [3,7,1,23,45,21,12]
b = (0,2,33,55,11)
a += b
n = int(input())
if a.count(n) > 0:
    print(a.index(n))
else:
    print('n is not find')

3：

代码：

class Student(object):
    def __init__(self,name,score):
        self._name = name
        self._score = score

    def getscore(self):
        return self._score

    def getname(self):
        return self._name

    def showAE(self):
        print('%s:%d:'%(self._name,self._score),end='')
        if self._score >=90:
            print('A')
        elif self._score >=80:
            print('B')
        elif self._score >=70:
            print('C')
        elif self._score >=60:
            print('D')
        else:
            print('E')


ls=[]
ls.append(Student('张三',45))
ls.append(Student('李思',78))
ls.append(Student('王吴',40))
ls.append(Student('周六',96))
ls.append(Student('赵琪',65))
ls.append(Student('孙霸',90))
ls.append(Student('郑九',78))
ls.append(Student('吴诗',99))
ls.append(Student('董世义',60))

minScore = ls[0].getscore() #最高分
maxScore = ls[0].getscore() #最低分
ave = 0 #平均分

for i in range(0,len(ls)):
    if ls[i].getscore() > maxScore:
        maxScore = ls[i].getscore()
    if ls[i].getscore() < minScore:
        minScore = ls[i].getscore()
    ave = ave + ls[i].getscore()

ave = ave / len(ls) #求平均分

print('最高分：%d，最低分:%d，平均分:%f'%(maxScore,minScore,ave))

# A-E输出
for i in range(0,len(ls)):
    ls[i].showAE()

4.

代码：

ls1=[3,7,1,23,45,21,12]
ls2=[0,2,33,55,11]
ls1 += ls2
n = int(input('n='))

flag = False #记录是否找到n
for i in range(0,len(ls1)):
    if ls1[i] == n:
        if flag == False:
            print(i) # 输出所有n的下标
        else:
            print(' %d'%i) # 输出所有n的下标
        flag = True

if flag == False:
    print("%d is not find"%n)

• 你可以看下这个问题的回答https://ask.csdn.net/questions/7800944

scores = [
    {"name": "张三", "score": 45},
    {"name": "李思", "score": 78},
    {"name": "王吴", "score": 40},
    {"name": "周六", "score": 96},
    {"name": "赵琪", "score": 65},
    {"name": "孙霸", "score": 90},
    {"name": "郑九", "score": 78},
    {"name": "吴诗", "score": 99},
    {"name": "董世义", "score": 60},
]

# 求最高分、最低分和平均分
scores_sorted = sorted(scores, key=lambda x: x["score"])
highest_score = scores_sorted[-1]["score"]
lowest_score = scores_sorted[0]["score"]
average_score = sum([s["score"] for s in scores]) / len(scores)

print("最高分：", highest_score)
print("最低分：", lowest_score)
print("平均分：", average_score)

# 将成绩从百分制转换成a-e制
def score_to_grade(score):
    if score >= 90:
        return "A"
    elif score >= 80:
        return "B"
    elif score >= 70:
        return "C"
    elif score >= 60:
        return "D"
    else:
        return "E"

for s in scores:
    s["grade"] = score_to_grade(s["score"])

print(scores)

第二题

# 给定列表
my_list = [3, 7, 1, 23, 45, 21, 12]

# 要插入的元素
new_elements = [0, 2, 33, 55, 11]

# 在原地插入元素
my_list.extend(new_elements)

# 要查找的元素
n = 33

# 查找元素n在列表中的下标位置
if n in my_list:
    index = my_list.index(n)
    print("元素n在列表中的下标位置为：", index)
else:
    print("n is not find")

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